Added a TODO message.

src/main/java/se/su/dsv/scipro/match/facade/ApplicationPeriodFacade.java

@@ -136,6 +136,7 @@ public class ApplicationPeriodFacade {
     }
 
     // a helper method, to avoid NPEs when using faulty test data
+    // TODO this method might be changed because start date and/or end date can never be null
     private boolean testForInvalidData(final ApplicationPeriod applicationPeriod) {
         return (applicationPeriod.getProjectClass() == null || applicationPeriod.getProjectClass().isEmpty() ||
                 applicationPeriod.getStartDate() == null || applicationPeriod.getEndDate() == null);